Earplug



FIG. 1 is a front elevation view of an earplug showing my new design, the rear, left side, and right side being identical thereto;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a perspective view thereof. 

The ornamental design for an earplug, as shown and described. 